ORGANOMETALLIC MODIFIED CARBOHYDRATES .5. CARBOHYDRATE FUNCTIONALIZEDOXACYCLOPENTYLIDENE COMPLEXES

Authors
EHLENZ R NEUSS O TECKENBROCK M DOTZ KH
Citation
R. Ehlenz et al., ORGANOMETALLIC MODIFIED CARBOHYDRATES .5. CARBOHYDRATE FUNCTIONALIZEDOXACYCLOPENTYLIDENE COMPLEXES, Tetrahedron, 53(14), 1997, pp. 5143-5158
Citations number
58
Categorie Soggetti
Chemistry Inorganic & Nuclear
Journal title
Tetrahedron → ACNP
ISSN journal
00404020
Volume
53
Issue
14
Year of publication
1997
Pages
5143 - 5158
Database
ISI
SICI code
0040-4020(1997)53:14<5143:OMC.CF>2.0.ZU;2-O
Abstract
Carbohydrate functionalized 2-oxacyclopentylidene complexes of chromiu m and tungsten 5a/b 8c/d are synthesized by cycloisomerization of buty nols 1a/b - 4a/b at a pentacarbonylmetal template. Their alpha-CH-acid ity is exploited to generate compounds 9a and 10a bearing exo-alkylide ne groups. Ring-opening aminolysis of 7a leads to aminocarbene complex 11a which - under Mitsunobu conditions - undergoes cyclization to giv e chromium azacyclopentylidene 12a. (C) 1997 Elsevier Science Ltd.